Incidentally, all three of these words are most commonly used to describe people who are stubborn. But you can also have a recalcitrant bureaucracy, an intransigent problem — or, obviously, an intractable propensity to lose your lunch.

Insidious is also the title of a 2010 horror film starring Patrick Wilson, Rose Byrne and Ty Simpkins. According to IMDB: “A family looks to prevent evil spirits from trapping their comatose child in a realm called The Further.” Seems likely that a haunted house could provide a steathily-spreading evil.

Relatedly, an insidious disease is “a disease existing, without marked symptoms, but ready to become active upon some slight occasion; a disease not appearing to be as bad as it really is.”

If you ask INSIDIOUS DISEASE about their definition of death metal they would probably answer that it should satisfy your urge for darkness, the morbid and the sick, the perverted and the twisted, all things insane that can be discovered within the human mind and soul manifesting in a sound that makes you vomit your guts out!

Don’t confuse insidious with the similar-sounding invidious, which means:

Use insidious for creeping, slow-moving evil, and invidious for actions done by humans that are immediately obvious as being harmful. Racist speech is invidious, and the lingering effects of racism have insidious effects on people’s lives.

Thanks to Bobby Brown, “prerogative” is one of the most mispronounced words in English — as you can hear in the video, Mr. Brown pronounces the word “PER-ogative.” (Click the audio icon on this page for a correct pronunciation).

Britney Spears repeats the error:

//www.youtube.com/watch?v=dIOH8Trfas4

A prerogative is an exclusive right or privilege held by a person or group, or the exclusive right and power to command, decide, rule, or judge.

According to Thesaurus.com:, “a privilege is a right that may be extended to a group or a number of people; a prerogative is a right that, customarily, is vested in a single person.”

It is the boss’s prerogative to determine the office supply budget.

While it is the prerogative of pop stars to pronounce words however they like in their videos, it is the prerogative of lexicographers to record the correct pronunciations of words in dictionaries.

The words warrant and license can be used in somewhat similar ways, although they are milder than prerogative.

The anti-death penalty activist argued that violence is not a warrant for future violence.

The pronunciation activist argued that fame does not give one license to butcher the English language, even if slightly improving the nation’s collective vocabulary in the process.

Canon means “the body of rules, principles, or standards accepted as axiomatic and universally binding in a field of study or art.” The adjective is canonical — for instance, The Great Gatsby is a canonical work in American literature.

A canon of science ought to cover the basics, as well as important classical ideas on which further exploration has been based.

Whirligig means “something that whirls or revolves, a whirling motion or course: the whirligig of fashion, or a giddy or flighty person.”

Here, whirligig is being used as an adjective — and indeed, one reviewer describes the book as having a “dizzying pace” (not surprising if you proceed from global warming to quantum tunneling within a couple hundred pages).

Manhattan Prep’s blog is written by one of our real-live GRE instructors. She teaches in New York. To learn about Manhattan Prep’s classes, go here. To suggest a word or topic for the blog, email jen@manhattanprep.com.

“Origin story” is an expression for a superhero’s backstory — for instance, Superman was born on Krypton just before it was destroyed. Many words also have fascinating origin stories. While English comes largely from Latin (and from Greek, and from Latin through French and Spanish, with some Germanic roots and a bit of Sanskrit, etc.), you’ll find that word usage can change quite bit over a couple thousand years.

In the 1950s, many people took cod liver oil as a health supplement. Today, fish oil capsules and flaxseed oil have supplanted the smelly old standby our grandparents used.

He did achieve his dream of becoming CEO, but only after supplanting our previous CEO by wresting control while she was battling cancer.

Some related words are:Outstrip (surpass, exceed; be larger or better than; leave behind)Overshadow (cast a shadow over, make to seem less important)Supersede (replace or cause to be set aside)Eclipse (obscure, darken, make less important)

Supplant comes from the Latin for to trip up (planta meant the sole of the foot). To supplant something is like a more mature version of sticking your leg out into the aisle so someone falls on his face.

The same root, “planta”, appears in the foot condition plantar fasciitis.

Here’s something a prodigiouslexicon is good for — naming nail polish colors when you’ve got 55 shades of “pink.”

If you are wont to frequent nail salons, you may have noticed that many of the color names involve puns (and often are not terribly descriptive of the color they purport to represent): Tart Deco, Lapis of Luxury, Pinking Up the Pieces, and my favorite … Sand of a Beach.

A few color names, however — currently in the Essie line — sport more erudite names containing GRE vocabulary words:

Demure Vixen

Demure means “characterized by shyness and modesty; reserved.” Culturally, demure is almost always used to describe women. A word that also means “reserved” and is often used to describe men is staid.

Interestingly, demure can also mean “affectedly or coyly decorous, sober, or sedate” — that is, faking being shy and reserved as a flirtation strategy. That makes more sense when paired with vixen, a female fox or what the dictionary describes as “an ill-tempered or quarrelsome woman,” a usage that has since fallen out of fashion. Vixen is often used in a fashion and pop culture context to describe a femme fatale or audaciously appealing woman. (This word is a bit too sexy for the GRE, though).